<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
.box{
	width:200px;
	height:200px;
	padding:50px;
	border:10px solid #000; 
	box-sizing:border-box;
}

</style>
</head>
<body>
<div class="box">
	
</div>
</body>
</html>
